Two things about that....one is who is Daisy anyway? I don't recall anyone being called Daisy in the movies at least....
And the other thing is that....that does seem a bit harsh, as in, them being murdered and all...I mean, he doesn't really need to do that. Cause Lotso can just as easily head back to Sunnyside, take control of the place once again while he then finds Buzz, Woody and co and gets revenge on them....well, that's how I would see him get things done that is....as in, gets rid of Ken and Barbie, convinces others to help him in his quest for revenge sort of thing.
I just see no reason for Lotso to go out of his way to actually murder anyone....